Who Declined the Nobel Prize ??? WHY?????????????

Has anyone ever declined the Nobel Prize? Why?

Six Nobel Laureates have declined the Prize:

Richard Kuhn, the 1938 Nobel Prize in Chemistry. He was "caused by the authorities of his country to decline the award but later received the diploma and the medal";

Adolf Butenandt, the 1939 Nobel Prize in Chemistry, “Caused by the authorities of his country to decline the award but later received the diploma and the medal”;

Gerhard Domagk, the 1939 Nobel Prize in Physiology or Medicine, “Caused by the authorities of his country to decline the award but later received the diploma and the medal”;

Boris Pasternak, the 1958 Nobel Prize in Literature, "Accepted first, later caused by the authorities of his country to decline the Prize";

Jean Paul Sartre, the 1964 Nobel Prize in Literature, declined the Prize;

Le Duc Tho, the 1973 Nobel Peace Prize, declined the Prize.